Abstract

A pulsed neutron time-of-flight system designed primarily for the investigation of radiative transitions induced by neutron capture in the epithermal region is described. The neutron burst is formed by a massive rotor fabricated from tungsten, nickel, and steel placed at the radial beam tube at the Brookhaven High Flux Beam Reactor (HFBR). A novel in-pile collimator is used to produce a relatively narrow spot size at the target, normally situated 22 m from the rotor, without the use of external collimation. Details of design, construction, and performance are given.

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